Calculate exact file download and upload durations across 4G, 5G, cable, and Gigabit fiber connections.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Type the file size and select MB, GB, or TB.
Compare download durations across connection speed tiers from 3 Mbps to 10 Gbps.
Copy individual or full matrix transfer estimates.
Network speeds are measured in bits (b), while file sizes are in bytes (B). 1 Byte = 8 bits, so 1 Gbps = 125 MB/s theoretical max.
Yes, a 5% TCP/IP packet framing and handshake overhead is factored into all calculations.
Zero-egress companion tools in the Calculators suite
Solve percentage increases, decreases, fractions, and discounts.
Calculate future investment value with recurring contributions.
Calculate monthly payments, total interest, and amortization schedule.
Calculate your monthly mortgage payments and total interest easily.
